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The Ultimate Cheat Sheet On Hadoop

Top 20 frequently asked questions to test your Hadoop knowledge given in the below Hadoop cheat sheet. Try finding your own answers and match the answers given here.

Question #1 

You have written a MapReduce job that will process 500 million input records and generate 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reducers which is a potential bottleneck. A custom implementation of which of the following interfaces is most likely to reduce the amount of intermediate data transferred across the network?

A. Writable
B. WritableComparable
C. InputFormat
D. OutputFormat
E. Combiner
F. Partitioner
Ans: e

Question #2 

Where is Hive metastore stored by default ?

B. In client machine in the form of a flat file.
C. In client machine in a derby database
D. In lib directory of HADOOP_HOME, and requires HADOOP_CLASSPATH to be modified.
Ans: c


AWS Certified Developer: Eligibility Criteria

The below is complete eligibility criteria is as follows- One or more years of hands-on experience designing and maintaining an AWS-based application.

In-depth knowledge of at least one high-level programming language. Understanding of core AWS services, uses, and basic architecture best practices.

Proficiency in designing, developing, and deploying cloud-based solutions using AWS.

Experience with developing and maintaining applications written for Amazon Simple Storage Service, Amazon DynamoDB, Amazon Simple Queue Service, Amazon Simple Notification Service, Amazon Simple Workflow Service, AWS Elastic Beanstalk, and AWS CloudFormation.

Related: AWS Basics for Software Engineer

The requirement for Developer Exam

  • Professional experience using AWS technology
  • Hands-on experience programming with AWS APIs
  • Understanding of AWS Security best practices
  • Understanding of automation and AWS deployment tools
  • Understanding storage options and their underlying consistency models
  • Excellent understanding of at least one
  • Understanding of stateless and loosely coupled distributed applications
  • Familiarity developing with RESTful API interfaces
  • Basic understanding of relational and non-relational databases
  • Familiarity with messaging & queuing services These training courses or other equivalent methodologies will assist in exam preparation:
  • Developing on AWS (aws.amazon.com/training/developing)
  • In-depth knowledge or training in at least one high-level programming language



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